Vessel-mounted acoustic Doppler current profiler (ADCP) data from the mouth of the Columbia River, Oregon and Washington, 2013

Dates

Start Date: 2013-06-14
End Date: 2013-06-16
Publication Date: 2017

Citation

Stevens, A.W., Gelfenbaum, G., MacMahan, J., Reniers, A.J.H.M., Elias, E.P., Sherwood, C.R., Carlson, E.M., 2017, Oceanographic measurements and hydrodynamic modeling of the mouth of the Columbia River, Oregon and Washington, 2013: U.S. Geological Survey data release, http://dx.doi.org/10.5066/F7NG4NS1.

Summary

This portion of the USGS data release presents data from spatial surveys of water column currents and acoustic backscatter collected in the mouth of the Columbia River, Oregon and Washington, in 2013 (USGS Field Activity S-03-13-WO). Measurements of current velocity, discharge, and acoustic backscatter amplitude in the water column were collected using a downward looking 600 kHz Teledyne RDI ADCP pole-mounted to the R/V Park Snavely. Positioning and orientation of the ADCP were measured using an Applanix POS MV 320 and recorded at 1 Hz intervals. Data acquisition and merging of the ADCP and positioning data were achieved with Teledyne RDI VMDAS software. While underway, profiles of current velocity and acoustic backscatter data were [...]

Summary

This portion of the USGS data release presents data from spatial surveys of water column currents and acoustic backscatter collected in the mouth of the Columbia River, Oregon and Washington, in 2013 (USGS Field Activity S-03-13-WO). Measurements of current velocity, discharge, and acoustic backscatter amplitude in the water column were collected using a downward looking 600 kHz Teledyne RDI ADCP pole-mounted to the R/V Park Snavely. Positioning and orientation of the ADCP were measured using an Applanix POS MV 320 and recorded at 1 Hz intervals. Data acquisition and merging of the ADCP and positioning data were achieved with Teledyne RDI VMDAS software. While underway, profiles of current velocity and acoustic backscatter data were collected from 1.48 m below the transducer (approximately 2.2 m below the water surface) to the seafloor at 0.5 m intervals. Raw ADCP data were transformed to Earth coordinates in real time using heading and tilt information supplied by the POS MV. Velocity measurements were corrected to remove the motion of the vessel using the bottom ping, which estimates the vessel speed with respect to the seabed.

A total of 25 km of vessel-mounted ADCP data were collected in the MCR between June 14 and June 16, 2013. Three cross-channel transects (fig. 1) were surveyed repeatedly to characterize changes in flow and backscatter amplitude at different stages of the tide cycle (Table 1). Current speeds recorded during the vessel-mounted surveys varied between 0.12 m/s and 1.99 m/s and 0.04 m/s and 2.48 m/s, for depth averaged and near-surface currents, respectively. The cross-channel velocity structure was often characterized by high variability along the transects (fig. 2) and over the tidal cycle. Digital files containing the current data from each transect are available in netCDF format.

Table 1. Transect number, start time, end time, and filename for vessel-mounted ADCP data collected in the mouth of the Columbia River, Oregon and Washington, in 2013. The locations of transects are shown in Figure 1. Times are given in Greenwich Mean Time (GMT).
Transect	Date (yyyy-mm-dd)	Start Time (HH:MM:SS)	End Time (HH:MM:SS)	Filename
A	2013-06-14	15:45:40	16:07:51	mcr13_vmadcp_0614_1545.nc
B	2013-06-14	16:50:31	17:01:05	mcr13_vmadcp_0614_1650.nc
C	2013-06-14	16:34:33	16:49:28	mcr13_vmadcp_0614_1634.nc
A	2013-06-14	17:15:41	17:33:46	mcr13_vmadcp_0614_1715.nc
B	2013-06-14	18:15:23	18:24:30	mcr13_vmadcp_0614_1815.nc
C	2013-06-14	18:01:55	18:14:12	mcr13_vmadcp_0614_1801.nc
B	2013-06-14	21:43:33	21:54:07	mcr13_vmadcp_0614_2143.nc
C	2013-06-14	21:32:04	21:41:03	mcr13_vmadcp_0614_2132.nc
A	2013-06-14	22:12:33	22:29:35	mcr13_vmadcp_0614_2212.nc
B	2013-06-14	22:56:12	23:09:32	mcr13_vmadcp_0614_2256.nc
C	2013-06-14	22:43:23	22:54:45	mcr13_vmadcp_0614_2243.nc
D	2013-06-16	17:04:49	17:12:36	mcr13_vmadcp_0616_1704.nc
BB1	2013-06-16	17:31:49	17:36:26	mcr13_vmadcp_0616_1731.nc
BB2	2013-06-16	17:39:12	17:46:04	mcr13_vmadcp_0616_1739.nc
BB3	2013-06-16	17:51:20	17:56:37	mcr13_vmadcp_0616_1751.nc
BB4	2013-06-16	17:59:46	18:02:01	mcr13_vmadcp_0616_1759.nc
E	2013-06-16	18:21:33	18:31:51	mcr13_vmadcp_0616_1821.nc

Figure 1. Map showing the locations of vessel-mounted ADCP data collected in the mouth of the Columbia River, Oregon and Washington, in 2013.

Figure 2. Example transect of vessel-mounted ADCP data collected in the mouth of the Columbia River, Oregon and Washington, in 2013. A, Map showing the location of transect and depth-averaged current velocity. B, Water levels relative to mean sea level recorded at NOAA station in Astoria. Gray bar indicates the time period the data were collected for this transect. C-E, Cross-sections showing the spatial variations in C, current speed, D, backscatter intensity, E, and current direction.

Contacts

Point of Contact :: PCMSC Science Data Coordinator
Originator :: Andrew Stevens, Guy R Gelfenbaum, Jamie MacMahan, Ad Reniers, Edwin P Elias, Christopher R Sherwood, Emily Carlson
Metadata Contact :: PCMSC Science Data Coordinator
Publisher :: U.S. Geological Survey
USGS Mission Area :: Natural Hazards
SDC Data Owner :: Pacific Coastal and Marine Science Center
Distributor :: U.S. Geological Survey - ScienceBase

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mcr13_vmadcp_metadata.xml Original FGDC Metadata	View	14.88 KB	application/fgdc+xml
mcr13_vmadcp_locs.png “Image showing transect locations”		2.09 MB	image/png
mcr13_vmadcp_example.png “Image showing example ADCP data”		1.34 MB	image/png
mcr13_vmadcp.zip “Zip file containing ADCP data in netCDF format”		797.73 KB	application/zip

Purpose

Characterize spatial variations in water-column currents and acoustic backscatter intensity in the mouth of the Columbia River.

Vessel-mounted acoustic Doppler current profiler (ADCP) data from the mouth of the Columbia River, Oregon and Washington, 2013

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